• Journal of Sensor Science and Technology
• /
• v.12 no.4
• /
• pp.176-184
• /
• 2003

In this paper, a swallowable miniaturized capsule, which applicable for electrical stimulation of digestive organ to improve the motion of intestine in research purpose, is proposed and implemented. The developed capsule can be controlled for the behavior of the power on/off, amplitude and pulse rate for the patient stimulus, by internally equipped with miniaturized RF receiver that linked by the command of external transmitter. The experimental result of the implemented miniaturized capsule in the animal intestine show the ability of effective control for the stimulus parameters.

• Aerospace Engineering and Technology
• /
• v.3 no.1
• /
• pp.1-8
• /
• 2004

In this study, the method of computing and extracting the generalized unsteady aerodynamic matrices using MSC/NASTRAN and MSC/NASTRAN DMAP ALTER has been suggested for the analysis and control of aeroelastic phenomena such as flutter and gust response analysis. In addition to that, the method of approximating the generalized unsteady aerodynamic matrices using minimum state approximation method has been proposed in order to cast the aeroelastic equations of motion in state space form for aeroelastic analysis and control application. Simplified aircraft wing box model has been used for the validation of the methods suggested in this study.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.15 no.2
• /
• pp.253-258
• /
• 2020

Petrochemical industry complex in Korea always has high riskiness due to explosive and inflammable gases. To prevent these explosion, most facility of petrochemical industry complex requires the performance of explosive proof. The control panel, which is used as explosive proof, has been used the air injection method by manually from outside to constantly keep the temperature and pressure between inside and outside of the panel. In this paper, we propose the automatic temperature controller, which performs automatic heating and cooling according to temperature inside the panel in order to control temperature automatically.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2003.05c
• /
• pp.2089-2092
• /
• 2003

홈 네트워킹 기술을 이용하면 가정내의 각각의 기기를 연결하고, 인터넷에 동시에 접속할 수 있다. 뿐만 아니라 홈 네트워킹 기술로 연결된 가정 기기들은 상호운용이 가능하며 인터넷을 통해 외부에서도 가정내의 기기를 제어할 수 있다. 그러나 이러한 외부로부터의 제어 가능성으로 인하여 홈 네트워크에 대한 접근 및 제어에 대한 인증의 필요성이 대두되었을 뿐만 아니라 전자상거래의 증가 및 VPN을 이용한 자택근무의 증가로 인하여 홈 네트워크의 보안도 중요한 관리요소에 포함되었다. 본 논문에서는 흠 네트워크 보안 및 관리를 위한 홈 네트워크 관제 센터의 구조 및 설계에 대하여 기술한다. 기존의 흠 게이트웨이에 집중되었던 흠 네트워크 관리기능과 방화벽이나 사용자 인증 등의 보안 기능을 홈 네트워크 관제 센터로 이동함으로써 보안관리의 편리성 제공 및 홈 게이트웨이의 부하를 줄일 수 있을 뿐만 아니라 좀 더 완벽한 홈 네트워크 보안을 제공할 수 있다.

• Journal of the Korea Society of Computer and Information
• /
• v.29 no.7
• /
• pp.21-32
• /
• 2024

Since leather shoes cannot be washed with water, there is a need for a cleaning method that can remove extraneous substance from the inside and outside of shoes and senitize the inside of shoes without using water. For this purpose, this paper develops a shoes cleaning machine control system that automatically controls the entire process of shoes cleaning in a shoes cleaning machine that quickly cleans the inside and outside of shoes using compressed air, sterilization solution. The developed system uses Rasberry Pi, a general purpose single board computer(SBC), to control various actuators of the shoes cleaning machine. The shoes cleaning machine operated by the developed system shows a sterilization efficiency of more than 99% and an odor removal efficiency of more than 86% in a cleaning time of less than 1 minute.

• Journal of the Korean Crystal Growth and Crystal Technology
• /
• v.16 no.2
• /
• pp.53-58
• /
• 2006

When external field was applied to congruent $LiNbO_3$, it was investgated for domain formation and expansion of $LiNbO_3$. The domain wall velocities of 0.5 mm thickness $LiNbO_3$ were 28.70, 16.02 and $5.75{\mu}m/sec$ under poling field of 23.5, 22.0 and 21.0 kV/mm, respectively. As $1 M{\Omega}$ resistor was used in domain inversion system, harmonic domain inversion was not achieved by rapid domain expansion. And 50% duty cycle periodically poled $LiNbO_3$ have been fabricated by charge control using $10 M{\Omega}$ resistor.

• The Journal of the Acoustical Society of Korea
• /
• v.20 no.7
• /
• pp.13-20
• /
• 2001

The active noise cancellation system offers a better low frequency performance with a smaller and lighter system compared to a passive one. This paper presents an active noise control system capable of reducing the noise in a helmet after attenuating the external noise using the helmet as the passive noise reduction system, which consists of a controller for inverting and compensating the phase delay, a microphone for picking up the external noise, and a loudspeaker for radiating the acoustic anti-phase signal to reduce the external noise. In this paper, external noise can be reduced by noise controller by compensating the phase difference to be 180°in the frequency of maximun value in the amplitude response. The noise of the phase delay covered from 50°to 310°was reduced in this system and it is possible to obtain a noise reduction of up to approximately 20 dB at the ears in the enclosure.

• The Journal of Korean Association of Computer Education
• /
• v.3 no.2
• /
• pp.67-75
• /
• 2000

Due to the advantages of Internet, many teachers use Internet as an educational tool and due to the computerized works in schools, the usages of the Internet increase. However, because of the openness of the Internet, the sensitive data of an organization are exposed to outsiders and the Internet-based working has some problems such as the corruptions of instructional data or on-line assessment results. The need for protecting a school network from outsiders increases but the school networks with firewalls rarely exist. In this paper, in order to solve the security problem of a school network, we construct a hybrid firewall for school networks. In addition, we implement a graphical user interface for teachers to set up the access control rules of a hybrid firewall easily. The interface also provides the facilities such as log analysis, a real-time monitor for network traffics, and the statistic on traffics.

• Journal of the Institute of Electronics Engineers of Korea TC
• /
• v.39 no.1
• /
• pp.11-19
• /
• 2002

This paper gives an optimal step size of E$\sub$b/ /I$\sub$oT/ for outer-loop power control(OLPC) in IMT-2000 system. The performance of outer-loop Power control is affected greatly by the fixed step size according to the channel environments. Conventional methods are inaccurate because they are decided by expert's experiences and the performance is not proved theoretically. In this paper, we show that IMT-2000 system maintains optimal capacity and QoS by the step size of E$\sub$b/ /I$\sub$oT/ obtained from the discrete-time Markov chain model.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.17 no.11
• /
• pp.1219-1227
• /
• 1992

VXIbus is a standard for compatibility of instruments of multi-vendors and originated from the VMEbus. The devices for implementing VXIbus system can be categorized into the register based device and the message based device. In this paper we organized the A/D conversion module and the slot0 module, which form the register based VXIbus subsystem. The A/D conversion module is used as a digital voltmeter and LAN is used for communication between an external control computer and the slot0 module. The SCPI(Standard Commands for Programmable Instruments), which is a standard language for instruments, is transmitted from the external control computer to the slot0 module as the ASCII form, and then to the A/D conversion module after changing to the binary digit command. From the experiment. We verified that the measured voltage can be observed on external control computer and user interface can be improved by the modified graphic processing.